[amsat-bb] EsHail Microwave transponder satellite

[Žilvinas Atkočiūnas]

Hi all,

Any ideas how to use two antennas with single dish ? (one of them SAT LNB)

Zilvis LY2SS

2016-05-31 17:28 GMT+03:00 Rico van Genugten <rico.van.genugten at gmail.com>:

> Hi Remco,
>
> Sounds like you made a lot of progress on your Es'HailSat2 groundstation
> already. I would be interested to learn more about your transverter design
> and where you got the UMTS PA, and I'm sure some other people on this list
> too. :)
>
> Rico PA3RVG
>
>
>
> On Tue, May 31, 2016 at 12:07 PM, Remco <pa3fym at amsat.org> wrote:
>
> > >What are other folks planning to use on the uplink 2400 MHz and the down
> > >link at 10,489 MHz, for the narrowband linear transponder ?
> > I will use a cheap injection locked X-band PLL LNB with dielectric rod
> > and additional converter to let the NB transponder land inside one of the
> > bands my transceivers accomodate.
> > For the S-band uplink a dedicated (simple!) TX converter is now
> prototyped.
> > Output of the converter will be around 5 dBm to be inserted in an old
> UMTS
> > (2.1 GHz) module, capable of delivering around 20 - 30W at 2400 MHz on
> the
> > bench with this drive. Of course uplink output can be tweaked.
> > I am also busy with the dual band feed, of which the downlink of course
> is
> > inside the LNB.
> >
> > For the uplink I made a 6 turn LHCP helix but am now fiddling with the
> > matching due to
> > mechanical boundary conditions. At this moment of writing I (still)
> > haven't a good match
> > but I reckon this mechanical issue will be solved soon.
> > Secondly I need to experiment with the phase centers of both up- and
> > downlink
> > to maximise overall efficiency. Even when I'm not able to equalise both
> > phase centers
> > I have some room in my uplink budget to compensate for suboptimal
> > illumination.
> > In my prototype the LNB looks 'through' the helix.
> > Antenna will be a Triax 88cm broadcast satellite dish with f/D of around
> > 0.6.
> > All internal frequencies will be/are locked to GPS which allows my idea
> of
> > building a
> > SUT (satellite user terminal) [for portable use] in conjunction with one
> > (1) transceiver.
> > In other words, my concept will be that Es'hail2 behaves like a normal
> > amateur band, albeit with some delay ;-)
> > Remco PA3FYM
> >
> >
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> _______________________________________________
> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
> expressed
> are solely those of the author, and do not reflect the official views of
> AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
>